It could go either way, Rogue One turned out great in my opinion
Rouge One told a story I was interested in hearing (more interested in telling, actually).
The mystery wasn’t what was intriguing there. With Vader, the mystery is everything.
I agree. I would rather have not known anything about the Kessel Run. They could have done a movie about Solo and left that part unseen. The same with Vader. Just because they make a movie and Vader is the main villain, doesn’t mean any mystery has to be spoiled. I’d say his appearance in Rogue One added greatly to his menacing quality. I’ll take more of that. As for a story worth telling, that time period is ripe for developing characters and stories.
Christopher Nolan though? Not sure. I love Interstellar and Inception, but I can’t imagine what a Nolan Star Wars movie would be like.